Figure REF  shows the d/p and the
\(^{3}\) He/p ratios as a function of the average charged particle multiplicity per event.
The proton yields are taken from [1]}, [2]}.
The observed values of about \(3.6\times 10^{-3}\)  for the d/p ratio
and about \(9.3 \times 10^{-6}\)  for the \(^{3}\) He/p ratio are in
agreement with expectations from the thermal-statistical
models [3]}, [4]}. Similar values for d/p
ratios are
also observed by the PHENIX experiment for Au-Au
collisions [5]}, [6]}. Since at RHIC energies
significant differences between nucleus and anti-nucleus production are present,
for this plot the geometrical mean is used which in a thermal
concept cancels the influence of the baryon chemical potential
(\(\mu _{\rm B}\) ) [1].[1]In a thermal model, the yield \(n_{B}\)  of a baryon with energy \(E\)  in a medium
of temperature \(T\)  is proportional to \(\exp (-{E - \mu _{B} \over T})\)  while the
yield of an anti-baryon \(n_{\overline{B}}\)  is proportional \(\exp (-{E + \mu _{B} \over T})\) .
The geometric mean \(\sqrt{n_{B}n_{\overline{B}}}\)  leads to a cancellation of the \(\mu _{B}\) .
Within the achieved experimental precision, no
dependence of these particle ratios on the event multiplicity is
observed at RHIC and LHC energies.
Also the \(\rm \overline{p}\) /p and the p/\(\pi \)  ratios hardly vary with
centrality [7]}, [2]} showing that
\(T_{\rm chem}\)  and \(\mu _{\rm B}\)  do not vary with centrality in
high energy collisions.
In a coalescence approach, the centrality independence disfavors
implementations in which the nuclei production is proportional to
the absolute proton multiplicity [9]} rather
than the particle density.
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